{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-17T05:35:58.500035+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"operator":{"type":"operator","id":"L18009","name":"Hanson Aggregates Pma Inc"},"controller":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L07690","name":"Standard Aggregates Inc"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1950-01-01","validTo":"1989-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L07690|1950-01-01|1989-09-30"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00224","name":"Standard Slag Company"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|M00224|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00224","name":"Standard Slag Company"},"object":{"type":"operator","id":"L07690","name":"Standard Aggregates Inc"},"validFrom":"1950-01-01","validTo":"1989-09-30","current":false,"derived":true,"evidenceMineId":"4602531","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L07690|1950-01-01|M00224|1950-01-01|107787"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02063","name":"Lafarge S A"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1987-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|M02063|1987-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04321","name":"Pioneer International Ltd"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1989-01-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|M04321|1989-01-16|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L13887","name":"Lafarge Construction Materials"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1989-10-01","validTo":"1996-05-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L13887|1989-10-01|1996-05-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02063","name":"Lafarge S A"},"object":{"type":"operator","id":"L13887","name":"Lafarge Construction Materials"},"validFrom":"1989-10-01","validTo":"1996-05-15","current":false,"derived":true,"evidenceMineId":"4602531","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L13887|1989-10-01|M02063|1987-01-01|123307"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16199","name":"Pioneer Mid-Atlantic Inc"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"1996-05-16","validTo":"2000-08-03","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L16199|1996-05-16|2000-08-03"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04321","name":"Pioneer International Ltd"},"object":{"type":"operator","id":"L16199","name":"Pioneer Mid-Atlantic Inc"},"validFrom":"1996-05-16","validTo":"2000-08-03","current":false,"derived":true,"evidenceMineId":"4602531","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L16199|1996-05-16|M04321|1989-01-16|131757"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L18009","name":"Hanson Aggregates Pma Inc"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"2000-08-04","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L18009|2000-08-04|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"2000-08-04","validTo":"2007-08-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|M00521|2000-08-04|2007-08-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"L18009","name":"Hanson Aggregates Pma Inc"},"validFrom":"2000-08-04","validTo":"2007-08-22","current":false,"derived":true,"evidenceMineId":"4602531","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L18009|2000-08-04|M00521|2000-08-04|112643"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"4602531","name":"IRON CITY PLANT"},"validFrom":"2007-08-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|M00004|2007-08-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"L18009","name":"Hanson Aggregates Pma Inc"},"validFrom":"2007-08-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"4602531","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4602531|L18009|2000-08-04|M00004|2007-08-23|101033"}}],"coverage":{"historyRecords":5,"edgeCount":14,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4602531","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}